Hoo-Hoo vs tails

Hoo-Hoo

noun
  • A member of Hoo-Hoo. 

tails

noun
  • Tailings, feints. 

  • The side of a coin that doesn't bear the picture of the head of state or similar. 

  • Tailings; waste. 

How often have the words Hoo-Hoo and tails occurred in a corpus of books? (source: Google Ngram Viewer )